1/*
2 * Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org>
3 * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
4 * Copyright (C) 2005 Eric Seidel <eric@webkit.org>
5 * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
6 * Copyright (C) Research In Motion Limited 2010. All rights reserved.
7 *
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
12 *
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16 * Library General Public License for more details.
17 *
18 * You should have received a copy of the GNU Library General Public License
19 * along with this library; see the file COPYING.LIB.  If not, write to
20 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
21 * Boston, MA 02110-1301, USA.
22 */
23
24#include "config.h"
25
26#if ENABLE(FILTERS)
27#include "FEOffset.h"
28
29#include "Filter.h"
30#include "GraphicsContext.h"
31#include "RenderTreeAsText.h"
32#include "TextStream.h"
33
34namespace WebCore {
35
36FEOffset::FEOffset(Filter* filter, float dx, float dy)
37    : FilterEffect(filter)
38    , m_dx(dx)
39    , m_dy(dy)
40{
41}
42
43PassRefPtr<FEOffset> FEOffset::create(Filter* filter, float dx, float dy)
44{
45    return adoptRef(new FEOffset(filter, dx, dy));
46}
47
48float FEOffset::dx() const
49{
50    return m_dx;
51}
52
53void FEOffset::setDx(float dx)
54{
55    m_dx = dx;
56}
57
58float FEOffset::dy() const
59{
60    return m_dy;
61}
62
63void FEOffset::setDy(float dy)
64{
65    m_dy = dy;
66}
67
68void FEOffset::determineAbsolutePaintRect()
69{
70    FloatRect paintRect = inputEffect(0)->absolutePaintRect();
71    Filter* filter = this->filter();
72    paintRect.move(filter->applyHorizontalScale(m_dx), filter->applyVerticalScale(m_dy));
73    paintRect.intersect(maxEffectRect());
74    setAbsolutePaintRect(enclosingIntRect(paintRect));
75}
76
77void FEOffset::apply()
78{
79    if (hasResult())
80        return;
81    FilterEffect* in = inputEffect(0);
82    in->apply();
83    if (!in->hasResult())
84        return;
85
86    ImageBuffer* resultImage = createImageBufferResult();
87    if (!resultImage)
88        return;
89
90    setIsAlphaImage(in->isAlphaImage());
91
92    FloatRect drawingRegion = drawingRegionOfInputImage(in->absolutePaintRect());
93    Filter* filter = this->filter();
94    drawingRegion.move(filter->applyHorizontalScale(m_dx), filter->applyVerticalScale(m_dy));
95    resultImage->context()->drawImageBuffer(in->asImageBuffer(), ColorSpaceDeviceRGB, drawingRegion);
96}
97
98void FEOffset::dump()
99{
100}
101
102TextStream& FEOffset::externalRepresentation(TextStream& ts, int indent) const
103{
104    writeIndent(ts, indent);
105    ts << "[feOffset";
106    FilterEffect::externalRepresentation(ts);
107    ts << " dx=\"" << dx() << "\" dy=\"" << dy() << "\"]\n";
108    inputEffect(0)->externalRepresentation(ts, indent + 1);
109    return ts;
110}
111
112} // namespace WebCore
113
114#endif // ENABLE(FILTERS)
115